3.5X-X=1.5 2.5X=1.5 X=0.6望采纳`(*∩_∩*)′
3.5x-x=1.5,2.5x=1.5,x=0.6
2.5X=1.5 X=1.5/2.5=0.6
2.5x=1.5x=0.6
3·5x-1x=1·5